BaTiO3 nanocubes-Gelatin composites for piezoelectric harvesting: Modeling and experimental study

Cristina Elena Ciomaga, Nadejda Horchidan, Leontin Padurariu, Radu Stefan Stirbu, Vasile Tiron, Florin Mihai Tufescu, Ionut Topala, Oana Condurache, Mihaela Botea, Ioana Pintilie, Lucian Pintilie, Aurelian Rotaru, Gabriel Caruntu, Liliana Mitoseriu

Research output: Contribution to journalArticlepeer-review

Abstract

Flexible composites containing BaTiO3 nanoparticles into Gelatin bio-polymer matrix were designed and investigated. Following the idea that the electric field concentration in corners/edges at the interfaces between dissimilar materials give rise to enhanced effective permittivity in composites, cuboid-like BaTiO3 nanoparticles have been employed as nanofillers into Gelatin matrix by using an inexpensive solution-based processing method. As predicted by finite element method simulations developed for cubic-like inclusions into a homogeneous polymer matrix, the experimental permittivity of xBT-(1-x)Gelatin composites increases when increasing the high-permittivity filler addition. For the composition x = 40 wt% (corresponding to 12 vol% BaTiO3 addition), permittivity reaches εr ∼15.7 with respect to εr ∼9.8 of pure Gelatine (measured at 105 Hz), while the average piezoelectric coefficient d33 as determined by piezoelectric force microscopy shows a remarkable increase up to 21 pm/V in composites with x = 40 wt%, in comparison to ∼7 pm/V in pure Gelatin. By using the experimentally determined material constants, the simulated piezoelectric voltage output vs. time has shown a similar increase (about a doubling of its amplitude) of the harvesting signal in the composite with x = 40 wt% BT, with respect to one of the polymer matrix, thus demonstrating the beneficial role of embedding BT nanoparticles into the biopolymer for increasing the mechanical harvesting response.

Original languageEnglish
JournalCeramics International
DOIs
StateAccepted/In press - 2022

Keywords

  • BaTiO
  • Biomedical applications
  • Nanocomposites
  • Piezoelectric properties

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